[Philsworld]

Cannot sin. Or, “is not able to go on sinning,” or “is not able to go on habitually sinning.” This does not mean that the Christian is incapable of committing a wrong act. If he were unable to sin, there would be no virtue in his being without sin, and there would be no true development of character. John has already implied that he will make occasional mistakes (see on ch. 2:1). The passage means that, having been born of God, and having God’s life-giving power dwelling in him, he cannot continue his old pattern of habitual sin. He now follows the sinless ideals that have been implanted in his soul by the new birth.

[Philsworld]

1 John 3:6

Sinneth not. Or, “does not continue to sin,” or “does not habitually sin,” as the form of the Greek verb implies. The apostle is here speaking of habitual sin, not of occasional mistakes which every Christian is prone to make (see on ch. 2:1). John knows that Christians are inveigled into sin (ch. 1:8, 10), but he also knows the remedy for such failures (chs. 1:9; 2:1). Here he is speaking of the ideal state that is attainable by one who habitually abides in the protecting presence of the sinless Saviour.

Whosoever sinneth. That is, whosoever habitually sins (see above on “whosoever abideth”). John refers to the one who habitually sins, the one who continues to practice sin.

[MHGinTN]

Your carnal mind is unable to see the SPIRITUAL so it focuses upon the carnality. The spirit is the portion of the born agains that is indwelt by the Spirit of God, not the flesh (the behavior mechanism of soul and body). The Word of God is sharper than any two-edged sword able to separate soul and spirit. The separated spirit has the eed of Him abiding there so it cannot sin. The flesh? well it goes on sinning since it is all that it knows to do. BUT even it can be slowly renewed by spirit guidance. ‘Be ye transformed by the renewing of your mind’ wrote Paul.